Also called snizz, it's known as the act of sneezing and cuming at the same time. This unfortunate event leaves its male victim with a face full of cum, and a crotch full of mucus. This undesired result usually happens to lonely guys who have allergies.

well "snum" comes from a mix of snot and cum , and heres the def. : It can happen two ways. #1:After a female or male give a guy a long blowjob ,and he shots his wad in her/his mouth and a few seconds after that before she/he swallows she/he sneezes resulting in the snot and cum to mix and come out her nose . #2:When you sneeze at the exact second you orgasm , feels very strange and cool.

exp. 1
dude 1 "Man after a long bj this chick took down my load and then she sneezed and it landed on my chest , it was gnarly dude"
exp. 2
dude 2 "Man awesome , when I was jackin off I sneezed right when I was about to shot my jizm all over , it awesome dude."